<?php

/** ******************************************************************************
 * brophp.com 分页类，可以自定义分页显示内容。                                   *
 * *******************************************************************************
 * 许可声明：专为《细说PHP》读者及LAMP兄弟连学员提供的“学习型”超轻量级php框架。*
 * *******************************************************************************
 * 版权所有 (C) 2011-2013 北京易第优教育咨询有限公司，并保留所有权利。           *
 * 网站地址: http://www.lampbrother.net (LAMP兄弟连)                             *
 * *******************************************************************************
 * $Author: 高洛峰 (skygao@lampbrother.net) $                                    *
 * $Date: 2011-07-18 10:00:00 $                                                  *
 * ******************************************************************************/
class Page
{
    private $total;    //数据表中总记录数
    private $listRows; //每页显示行数
    private $limit;    //SQL语句使用limit从名
    private $uri;      //url地址
    private $pageNum;  //页数
    private $page;
    //在分页信息中显示内容，可以自己设置
    private $config = array('head' => "条记录", "prev" => "上一页", "next" => "下一页", "first" => "首页", "last" => "末页");
    private $listNum = 10; //默认分页列表显示的个数

    /**
     * 构造方法，可以设置分页类的属性
     * @param    int $total 计算分页的总记录数
     * @param    int $listRows 可选的，默认每页需要显示的记录数
     * @param    string $pa 可选的，为向目标页面传递参数
     * @param    bool $ord 可选的，默认值为true, 如果为true默认页为第一页，false则为最后一页
     */
    public function __construct($total, $listRows = 25, $pa = "", $ord = true)
    {
        $this->total = $total;
        $this->listRows = $listRows;
        $this->uri = $this->getUri($pa);
        $this->pageNum = ceil($this->total / $this->listRows);
        if (!empty($_GET["page"])) {
            $page = $_GET["page"];
        } else {
            if ($ord)
                $page = 1;
            else
                $page = $this->pageNum;
        }

        if ($total > 0) {
            if (preg_match('/\D/', $page)) {
                $this->page = 1;
            } else {
                $this->page = $page;
            }
        } else {
            $this->page = 0;
        }


        $this->limit = $this->setLimit();
    }

    /**
     * 用于设置显示分页的信息，可以连贯操作
     * @param    string $param 是数组config的下标
     * @param    string $value 用于设置config下标对应的元素值
     * @return    object        返回本对象自己$this
     */
    function set($param, $value)
    {
        if (array_key_exists($param, $this->config)) {
            $this->config[$param] = $value;
        }
        return $this;
    }

    private function setLimit()
    {
        if ($this->page > 0)
            return ($this->page - 1) * $this->listRows . ", {$this->listRows}";
        else
            return 0;
    }

    private function getUri($pa)
    {
        if ($pa == "")
            return $GLOBALS["url"] . $_GET["a"] . '/';
        else
            return $GLOBALS["url"] . $_GET["a"] . '/' . trim($pa, "/") . '/';
    }

    public function __get($args)
    {
        if ($args == "limit" || $args == "page")
            return $this->$args;
        else
            return null;
    }

    private function start()
    {
        if ($this->total == 0)
            return 0;
        else
            return ($this->page - 1) * $this->listRows + 1;
    }

    private function end()
    {
        return min($this->page * $this->listRows, $this->total);
    }

    private function firstprev()
    {
        if ($this->page > 1) {
            $str = "&nbsp;<a href='{$this->uri}page/1'>{$this->config["first"]}</a>";
            $str .= "&nbsp;<a href='{$this->uri}page/" . ($this->page - 1) . "'>{$this->config["prev"]}</a>&nbsp;";
            return $str;
        }

    }


    private function pageList()
    {
        $linkPage = "&nbsp;<b>";

        $inum = floor($this->listNum / 2);

        for ($i = $inum; $i >= 1; $i--) {
            $page = $this->page - $i;

            if ($page >= 1)
                $linkPage .= "<a href='{$this->uri}page/{$page}'>{$page}</a>&nbsp;";

        }

        if ($this->pageNum > 1)
            $linkPage .= "<span style='padding:1px 2px;background:#BBB;color:white'>{$this->page}</span>&nbsp;";


        for ($i = 1; $i <= $inum; $i++) {
            $page = $this->page + $i;
            if ($page <= $this->pageNum)
                $linkPage .= "<a href='{$this->uri}page/{$page}'>{$page}</a>&nbsp;";
            else
                break;
        }
        $linkPage .= '</b>';
        return $linkPage;
    }

    private function nextlast()
    {
        if ($this->page != $this->pageNum) {
            $str = "&nbsp;<a href='{$this->uri}page/" . ($this->page + 1) . "'>{$this->config["next"]}</a>&nbsp;";
            $str .= "&nbsp;<a href='{$this->uri}page/" . ($this->pageNum) . "'>{$this->config["last"]}</a>&nbsp;";
            return $str;
        }

    }

    private function goPage()
    {
        if ($this->pageNum > 1) {
            return '&nbsp;<input style="width:20px;height:17px !important;height:18px;border:1px solid #CCCCCC;" type="text" onkeydown="javascript:if(event.keyCode==13){var page=(this.value>' . $this->pageNum . ')?' . $this->pageNum . ':this.value;location=\'' . $this->uri . 'page/\'+page+\'\'}" value="' . $this->page . '"><input style="cursor:pointer;width:25px;height:18px;border:1px solid #CCCCCC;" type="button" value="GO" onclick="javascript:var page=(this.previousSibling.value>' . $this->pageNum . ')?' . $this->pageNum . ':this.previousSibling.value;location=\'' . $this->uri . 'page/\'+page+\'\'">&nbsp;';
        }
    }

    private function disnum()
    {
        if ($this->total > 0) {
            return $this->end() - $this->start() + 1;
        } else {
            return 0;
        }
    }

    /**
     * 按指定的格式输出分页
     * @param    int    为0-7的数字，每个数字作为一个参数，可以自定义输出分页结构和调整结构的顺序<br>
     * $html[0] = "&nbsp;共<b> {$this->total} </b>{$this->config["head"]}&nbsp;"; <br>
     * $html[1] = "&nbsp;本页 <b>" . $this->disnum() . "</b> 条&nbsp;";<br>
     * $html[2] = "&nbsp;本页从 <b>{$this->start()}-{$this->end()}</b> 条&nbsp;";<br>
     * $html[3] = "&nbsp;<b>{$this->page}/{$this->pageNum}</b>页&nbsp;";<br>
     * $html[4] = $this->firstprev();<br>
     * $html[5] = $this->pageList();<br>
     * $html[6] = $this->nextlast();<br>
     * $html[7] = $this->goPage();<br>
     * @return    string    分页信息内容
     */
    function fpage()
    {
        $arr = func_get_args();

        $html[0] = "&nbsp;共<b> {$this->total} </b>{$this->config["head"]}&nbsp;";
        $html[1] = "&nbsp;本页 <b>" . $this->disnum() . "</b> 条&nbsp;";
        $html[2] = "&nbsp;本页从 <b>{$this->start()}-{$this->end()}</b> 条&nbsp;";
        $html[3] = "&nbsp;<b>{$this->page}/{$this->pageNum}</b>页&nbsp;";
        $html[4] = $this->firstprev();
        $html[5] = $this->pageList();
        $html[6] = $this->nextlast();
        $html[7] = $this->goPage();

        $fpage = '<div style="font:12px \'\5B8B\4F53\',san-serif;">';
        if (count($arr) < 1)
            $arr = array(0, 1, 2, 3, 4, 5, 6, 7);


        for ($i = 0; $i < count($arr); $i++)
            $fpage .= $html[$arr[$i]];

        $fpage .= '</div>';
        return $fpage;
    }
}
